/**
 * 仪表板控制器
 * 提供系统概览、统计数据和监控功能
 */

const logger = require('../../logger');

class DashboardController {
    /**
     * 获取系统概览数据
     * @param {Object} req - Express请求对象
     * @param {Object} res - Express响应对象
     */
    async getOverview(req, res) {
        try {
            // 模拟系统概览数据
            const overview = {
                totalUsers: 1256,
                activeUsers: 342,
                totalContentItems: 897,
                totalCalculations: 4532,
                systemStatus: 'operational',
                serverUptime: '15d 8h 34m',
                lastBackup: '2024-01-20T02:00:00Z'
            };
            
            logger.info('获取系统概览数据成功');
            res.status(200).json(overview);
        } catch (error) {
            logger.error(`获取系统概览数据失败: ${error.message}`);
            res.status(500).json({
                error: 'InternalServerError',
                message: '获取系统概览数据失败'
            });
        }
    }
    
    /**
     * 获取系统统计数据
     * @param {Object} req - Express请求对象
     * @param {Object} res - Express响应对象
     */
    async getStatistics(req, res) {
        try {
            const { period = 'week' } = req.query;
            
            // 模拟统计数据
            const statistics = {
                period,
                calculationsByType: {
                    bazi: 1234,
                    tarot: 876,
                    dreams: 543,
                    face: 321,
                    palm: 210
                },
                newUsers: period === 'day' ? 15 : period === 'week' ? 98 : 412,
                userRetention: {
                    day1: 0.78,
                    day7: 0.45,
                    day30: 0.23
                },
                peakHours: [
                    { hour: 9, count: 234 },
                    { hour: 10, count: 345 },
                    { hour: 20, count: 289 },
                    { hour: 21, count: 321 }
                ]
            };
            
            logger.info(`获取系统统计数据成功，周期: ${period}`);
            res.status(200).json(statistics);
        } catch (error) {
            logger.error(`获取系统统计数据失败: ${error.message}`);
            res.status(500).json({
                error: 'InternalServerError',
                message: '获取系统统计数据失败'
            });
        }
    }
    
    /**
     * 获取用户相关统计数据
     * @param {Object} req - Express请求对象
     * @param {Object} res - Express响应对象
     */
    async getUserStatistics(req, res) {
        try {
            // 模拟用户统计数据
            const userStatistics = {
                userGrowth: [
                    { date: '2024-01-15', count: 1120 },
                    { date: '2024-01-16', count: 1156 },
                    { date: '2024-01-17', count: 1189 },
                    { date: '2024-01-18', count: 1210 },
                    { date: '2024-01-19', count: 1234 },
                    { date: '2024-01-20', count: 1256 }
                ],
                userDistributionByRegion: {
                    '北京': 213,
                    '上海': 189,
                    '广州': 156,
                    '深圳': 145,
                    '其他': 553
                },
                activeUsersByDevice: {
                    mobile: 687,
                    desktop: 456,
                    tablet: 113
                },
                averageSessionDuration: 45.7 // 分钟
            };
            
            logger.info('获取用户相关统计数据成功');
            res.status(200).json(userStatistics);
        } catch (error) {
            logger.error(`获取用户相关统计数据失败: ${error.message}`);
            res.status(500).json({
                error: 'InternalServerError',
                message: '获取用户相关统计数据失败'
            });
        }
    }
    
    /**
     * 获取系统使用情况统计
     * @param {Object} req - Express请求对象
     * @param {Object} res - Express响应对象
     */
    async getUsageStatistics(req, res) {
        try {
            // 模拟使用情况统计
            const usageStatistics = {
                calculationsPerDay: [
                    { day: '周一', count: 892 },
                    { day: '周二', count: 945 },
                    { day: '周三', count: 876 },
                    { day: '周四', count: 1023 },
                    { day: '周五', count: 1123 },
                    { day: '周六', count: 789 },
                    { day: '周日', count: 654 }
                ],
                mostPopularServices: [
                    { service: '八字测算', usage: 35.4 },
                    { service: '塔罗占卜', usage: 28.7 },
                    { service: '解梦', usage: 15.6 },
                    { service: '面相分析', usage: 12.3 },
                    { service: '手相分析', usage: 8.0 }
                ],
                averageCalculationTime: 0.87 // 秒
            };
            
            logger.info('获取系统使用情况统计成功');
            res.status(200).json(usageStatistics);
        } catch (error) {
            logger.error(`获取系统使用情况统计失败: ${error.message}`);
            res.status(500).json({
                error: 'InternalServerError',
                message: '获取系统使用情况统计失败'
            });
        }
    }
    
    /**
     * 获取系统性能指标
     * @param {Object} req - Express请求对象
     * @param {Object} res - Express响应对象
     */
    async getPerformanceMetrics(req, res) {
        try {
            // 模拟性能指标
            const performanceMetrics = {
                cpuUsage: 0.45,
                memoryUsage: 0.67,
                diskSpace: {
                    total: 500,
                    used: 320,
                    free: 180
                },
                responseTime: {
                    average: 0.34,
                    p95: 0.87,
                    p99: 1.56
                },
                apiCallCounts: {
                    success: 12345,
                    error: 123,
                    timeout: 15
                }
            };
            
            logger.info('获取系统性能指标成功');
            res.status(200).json(performanceMetrics);
        } catch (error) {
            logger.error(`获取系统性能指标失败: ${error.message}`);
            res.status(500).json({
                error: 'InternalServerError',
                message: '获取系统性能指标失败'
            });
        }
    }
    
    /**
     * 获取系统警报列表
     * @param {Object} req - Express请求对象
     * @param {Object} res - Express响应对象
     */
    async getAlerts(req, res) {
        try {
            const { severity = 'all' } = req.query;
            
            // 模拟警报数据
            let alerts = [
                {
                    id: '1',
                    severity: 'warning',
                    title: 'CPU使用率过高',
                    message: 'CPU使用率已超过80%，持续时间超过10分钟',
                    timestamp: '2024-01-20T10:23:45Z',
                    status: 'active'
                },
                {
                    id: '2',
                    severity: 'error',
                    title: '数据库连接失败',
                    message: '部分数据库连接失败，可能影响部分功能',
                    timestamp: '2024-01-20T09:12:34Z',
                    status: 'resolved'
                },
                {
                    id: '3',
                    severity: 'info',
                    title: '系统备份完成',
                    message: '每日系统备份已成功完成',
                    timestamp: '2024-01-20T02:00:12Z',
                    status: 'resolved'
                }
            ];
            
            // 根据严重程度过滤
            if (severity !== 'all') {
                alerts = alerts.filter(alert => alert.severity === severity);
            }
            
            logger.info(`获取系统警报列表成功，严重程度: ${severity}`);
            res.status(200).json(alerts);
        } catch (error) {
            logger.error(`获取系统警报列表失败: ${error.message}`);
            res.status(500).json({
                error: 'InternalServerError',
                message: '获取系统警报列表失败'
            });
        }
    }
    
    /**
     * 获取最近活动日志
     * @param {Object} req - Express请求对象
     * @param {Object} res - Express响应对象
     */
    async getRecentActivities(req, res) {
        try {
            const { limit = 20 } = req.query;
            
            // 模拟最近活动
            const recentActivities = [
                {
                    id: '1',
                    type: 'user_login',
                    user: 'admin',
                    action: '管理员登录系统',
                    ip: '192.168.1.100',
                    timestamp: '2024-01-20T11:34:56Z'
                },
                {
                    id: '2',
                    type: 'content_update',
                    user: 'editor1',
                    action: '更新八字内容配置',
                    ip: '192.168.1.101',
                    timestamp: '2024-01-20T10:45:32Z'
                },
                {
                    id: '3',
                    type: 'user_operation',
                    user: 'admin',
                    action: '禁用用户账号 user123',
                    ip: '192.168.1.100',
                    timestamp: '2024-01-20T09:23:45Z'
                },
                {
                    id: '4',
                    type: 'system_event',
                    user: 'system',
                    action: '自动备份完成',
                    ip: 'localhost',
                    timestamp: '2024-01-20T02:00:12Z'
                }
            ].slice(0, parseInt(limit));
            
            logger.info(`获取最近活动日志成功，限制: ${limit}`);
            res.status(200).json(recentActivities);
        } catch (error) {
            logger.error(`获取最近活动日志失败: ${error.message}`);
            res.status(500).json({
                error: 'InternalServerError',
                message: '获取最近活动日志失败'
            });
        }
    }
    
    /**
     * 获取系统健康状态
     * @param {Object} req - Express请求对象
     * @param {Object} res - Express响应对象
     */
    async getHealthStatus(req, res) {
        try {
            // 模拟健康状态
            const healthStatus = {
                status: 'healthy',
                components: [
                    {
                        name: 'database',
                        status: 'healthy',
                        responseTime: 0.12
                    },
                    {
                        name: 'cache',
                        status: 'healthy',
                        responseTime: 0.05
                    },
                    {
                        name: 'fileStorage',
                        status: 'healthy',
                        spaceAvailable: '68%'
                    },
                    {
                        name: 'externalAPIs',
                        status: 'degraded',
                        details: '部分非关键API响应缓慢'
                    }
                ],
                checks: [
                    {
                        name: 'databaseConnection',
                        status: 'passed',
                        lastCheck: '2024-01-20T11:30:45Z'
                    },
                    {
                        name: 'diskSpace',
                        status: 'passed',
                        lastCheck: '2024-01-20T11:30:45Z'
                    },
                    {
                        name: 'memoryUsage',
                        status: 'passed',
                        lastCheck: '2024-01-20T11:30:45Z'
                    }
                ]
            };
            
            logger.info('获取系统健康状态成功');
            res.status(200).json(healthStatus);
        } catch (error) {
            logger.error(`获取系统健康状态失败: ${error.message}`);
            res.status(500).json({
                error: 'InternalServerError',
                message: '获取系统健康状态失败'
            });
        }
    }
}

module.exports = new DashboardController();